Mechanical coupling



FIG. 1 is a side elevation view of a mechanical coupling design of thepresent invention;

FIG. 2 is a top plan view of the mechanical coupling of FIG. 1;

FIG. 3 is a bottom plan view of the mechanical coupling of FIG. 1;

FIG. 4 is another side elevation view of the mechanical coupling of FIG.1; and,

FIG. 5 is a front elevation view of the mechanical coupling of FIG. 1.

The ornamental design for a mechanical coupling, as shown and described. 